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Ronaldinho and Beckham collect star cards together. They have 45 cards, of which Beckham's star card is less than five-seventh of Ronaldinho's.
Solution: If Ronaldinho has X cards, Beckham has (5/7)x-3 cards.

x+(5/7)x-3=45

( 12/7)x=48

x=48 (7/ 12)

x=28

28 -3= 17 (Zhang)

A: Ronaldinho has a 28-star card and Beckham 17-star card.